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Here we have evidence for earthquake-triggered mass transport deposits in Lake Ozette, Washington, a 103-meter deep coastal lake off the coast of the Olympic Peninsula, along the outer coast of the United States. Lake Ozette is likely located above the frozen portion of the northern Cascadia megathrust and is relatively far away from suspected active upper-plate faults capable of generating large magnitude earthquakes. Topo-bathymetry data of the entire lake basin is refined to 2 m resolution when combined with new subaerial LiDAR results. Several sub-basins are separated by bathymetric sills, describing the basin's physiography; the eastern sub-basins are proximal to fluvial catchments and small subaqueous deltas; the western sub-basin is isolated from any significant fluvial sediment sources; and the eastern sub-basins are proximal to fluvial catchments and small sub-basins are proximal to fluvial sediment sources; These cores were designed in August 2021 to sample the entire Holocene sample; these cores may have the most complete list of subaqueous MTDs resulting from large megathrust ruptures along this stretch of the Cascadia subduction zone.
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